To make use of Qt with FlowLine2 You should make the subsequent modification: QTreeView::indexRowSizeHint needs to be Digital; the correspondig line in qtreeview.h should look like: Web page legit???or ??is it|could it be|can it be} a scam Internet site???or ??is this|Is that this} a secure website???or ??is This great site authentic?|Also fetching